Which of the following properties is more likely to be a characteristic of a halo star in the Milky Way, not a disk star?
A) It orbits the center of the Milky Way galaxy.
B) It has a low ratio of iron to hydrogen.
C) It could be quite young.
D) It is moving very slowly relative to the Sun's motion.

Question

Quizplus · Accepted Answer

Halo stars are old and formed early in the history of the Milky Way, before the disk stars. Therefore, they have a lower metallicity (ratio of metals to hydrogen) than disk stars. This makes option B the correct answer.

Which of the Following Properties Is More Likely to Be